In this steamy, taboo encounter, a horny sister and her stepbrother can't resist their primal urges. Alone in the house, they start by pleasuring themselves, but when he catches her mid-orgasm, their tension escalates. They argue, but the sexual tension is palpable. Soon, they're naked and masturbating together, her eyes locked on his throbbing cock. She fantasizes about feeling him inside her, and just as they're about to cross the final line, a sudden noise forces them to abort their illicit union.